Production method for high-purity hard-agglomeration-free superfine nickel oxide or cobalt and nickel or cobalt powder

Abstract

The invention discloses a production method for high-purity hard-agglomeration-free superfine nickel oxide or cobalt and nickel or cobalt powder; the production method comprises the following steps of: adopting P204 and P507 to extract nickel nitrate, adopting P204 to extract cobalt nitrate, adding addition agents A and B, and sodium hydroxide into a nickel nitrate solution or a nickel nitrate solution for reaction under a temperature of 80 to 100 DEG C, freezing, drying and smashing washed or filtered nickel hydroxide or cobalt filter cake which is reduced into nickel or cobalt powder in a hydrogen furnace; or roasting the washed or filtered nickel hydroxide or cobalt filter cake in a calcining kiln so as to obtain nickel oxide or cobalt powder; the nickel oxide or cobalt powder is free of hard-agglomeration, the D50 is 2 to 3 microns, the content of purities is 20 to 100ppm, and the cost is low; a production system mainly adopting China patents of ''an exhaust gas absorption device for nitrate production'', ''an inorganic salt precipitate continuous washing machine '', ''a drying and grinding all-in-one machine'', ''an inorganic salt uniform roasting rotary kiln'' and a continuous production method can increase quality and production efficiency and reduces cost and environmental pollution.

Description

technical field [0001] The invention belongs to the field of chemical industry, and specifically relates to a production method of high-purity non-hard agglomerated superfine nickel oxide or cobalt and nickel or cobalt powder, a production system and a continuous production method. Background technique [0002] In recent years, with the continuous development and progress of science and technology, the demand for nickel oxide (cobalt) and nickel (cobalt) powder in chemical industry, electronics, and metallurgy is increasing, and the quality requirements are becoming more and more stringent. According to The existing national standard production can no longer meet the quality requirements of nickel (cobalt) oxide and nickel (cobalt) powder on the market. Ultrafine nickel (cobalt) powder has a great volume effect and surface effect Resistance, light absorption, chemical activity, etc. show many special properties, in catalysts, sintering activators, conductive pastes, batterie...

AI Technical Summary

Problems solved by technology

[0004] 1. Nickel carbonyl (cobalt) thermal decomposition method: This method has simple process, low cost, and high powder purity; but the powder is easy to sinter, has a wide particle size distribution, and poor crystallinity. Nickel carbonyl (cobalt) is highly toxic and easy to pollute. safety precaution

[0005] 2. Evaporation-condensation method: The nickel (cobalt) powder produced by this method has high purity, good crystallinity, smooth surface and strong oxidation resistance; but the equipment is complicated, the production efficiency is low, and the cost is high

[0006] 3. γ-ray radiation synthesis method: the advantage is that the intensity distribution is narrow and the anti-oxidation ability is strong, but the current process is not yet mature

[0008] 5. High-pressure hydrogen reduction method: simple operation, wide range of raw materials, and small powder particle size; but high-pressure equipment is required and the cost is high

[0010] 7. Microemulsion method: good shape, uniform distribution, and controllable particle size; but low yield, high cost, poor powder crystallization, and easy heat shrinkage

[0011] 8. Ultrasonic atomization-thermal decomposition method: the target composition is easy to control, the precursor is easy to obtain and the shape is controllable; but the powder particle size distribution is wide, and it is difficult to treat the waste gas after thermal decomposition

[0012] 9. Argon-protected mechanical ball mill: it can be operated continuously and has a large production capacity; but the particle size distribution is uneven and the shape is difficult to control

[0013] 10. Electrolysis method: the shape and size are easily controlled by the current: the powder is thicker and the energy consumption is high

[0014] At present, the ultra-fine (nano) nickel (cobalt) powders produced in batches in the international market mainly include chemical vapor deposition in Japan, nickel carbonyl (cobalt) decomposition in Canada, and evaporation used by QuantumSphere in the United States and Ningbo, China. -Condensation method, the production equipment of these methods is complicated and the cost is high, resulting in the price of ultrafine (nano) nickel (cobalt) powder in the international market at about 1,200 US dollars per kilogram

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